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PUD-74 Environmental Checklist 8. HYDROLOGY AND WATER QUALITY Environmental Setting The National Pollutant Discharge Elimination System (NPDES) was established in the Clean Water Act to regulate municipal and industrial dischazges to surface waters of the U.S. Non- pointpollution sources originate and diffuse over a wide area rather than from a definable point. Two types of non-point source discharges are controlled by the NPDES program; discharges caused by general construction activities and general quality of storm water in municipal stonnwater systems. Standards of Significance For purposes of this environmental document, an impact is considered significant if the proposed project would: • Result in substantially degrading water quality or violate any water quality objectives set by the State Water Resources Control Board due to increased sediments or other contaminants generated by consumption and/or operation activities; • Result in exposing people or property to the risk of injury and damage in the event of a 100-year flood. Less Than Po[rn[ially Significant Less Than Significant With Mitigation Significant No Issues Impact Incorporated Impact Impact Hvdroloav and Water Quali Would the project: a) Violate any water quality standards or waste discharge requirements? b) Substantially deplete groundwater supplies or ~ ~ ~ ~X interfere substantially with groundwater rechazge such that there would be a net deficit in aquifer volume or a lowering of the local groundwater table level (e.g., the production rate of pre- existing neazby wells would drop to a level which would not support existing land uses or planned uses for which permits have been granted)? c) Substantially alter the existing drainage pattern of the site or area, including through the alteration of the course of a stream or river, in a manner which would result in substantial erosion or siltation on- or off-site? 23